Sewing machine



y 1932- J. OLLENDORFF 1,860,870

SEWING MACHINE- Filed Feb. 10, 1928 Z'Sheets-Sheet 1 M5131, 1932- J. OLLENDORFF 1,860,870

SEWING MACHINE Filed F eb.10, 192s 2 Sheets-Sheet 2 Patented May 31, 9 V

UNITED" STATES-1' PATEN oFF1cE JACQUES OLLENDORFF, F PARIS, FRANCE, ASSIGNOR 'ro Aircrnns azrABLIssmyrmv'rs R. CORNELY & 00., socrsris ANONYME, 0e rams, snanonn COMPANY or manner:

SEWING MACHINE Application filed February 10, 1928, Serial ner as to form absolutely symmetrical rows of stitches, it is observed that when the speed of the machine exceeds a certain limit, the

two loops formed by the two threads of the needle are at a certain stage of the formation of the stitch thrown violently together; the 7 said loops thus make contact with one another and become entangled, so that the yarn will break when it is drawn back by the tension device;

In the present invention I obviate this defeet by placing a partition between the loops formed by the two needle threads whereby all contact between the said threads will be prevented, so that the sewing can be effected at a high rate of speed.

The said partition may be variouslycon- I structed and may consist of a metal plate 1" which is secured in the fixed positlon upon a suitable part of the machine, or may on the contrary be made removable and interchangeable. I

Fig. 1 shows in a machine of the type above i indicated the stage of the formation of the stitch in which the two loops are thrown violently together and shows the utility of the partition according to the invention by which the said loops are prevented 1 from meeting and from becoming knotted or entangled;

Fig. 2 is a diagrammatic plan View show- 7 in the same stage as Fig. 1;

ig. 3 is a side elevation, in the inverted position, of a needle plate which is provided according to the invention, with a stationary partition separating the loops which are formed; 7

Fig. 4 shows a movable partition mounted on the sup-port of the hook which draws forward the cloth;

Fig. 5 is a separate perspective view of the V partition shown in Fig. 4.

Fig. 1 represents the loopers and 11 with respective hooks A and B, said loopers being separated from their supports12-13 by the no. asaemaaa in France 1111 927, 1927. 7

pieces (known per se) which are designated as loop stretchers 1l15; In the recesses inthe said loopers aremounted the. cop holders .18-19 containing the cops upon which is.

wound the cop yarn, whose ends are observed at 20 and 21. A I

. The loopers are rotated by the respective pinions 22-.23, driven by the pinions 24 -25: mounted on the horizontal driving shaft 26 these pinions rotate inthe direction ofth'e arrow f The figures also show the tension device 27 I which is apertured at 28and 29'; by a pivoted arrangement, known per se, the said tension device is given avertical reciprocatlng motionwhose period is represented by the total rotation of the flywheel. shaft 80. By means, of suitable gearing, the shaft 26 is rotated at double the speed of the shaft 30; Fig. 1 ,fur ther represents the tension devices 31 32 carrying the yarn which proceeds to the. nee- I n thestage of movement'show'n in Fig. 1, the needles 33 and 34 begin to descend, The hooks A'and B, when turning ontheir axes, have formed the loops C and D; the tension 27, which is slowly rising, is about to finish.

its stroke by .a sudden and rapid movement.

The loops (land I) are then entirely as.

shown in the drawings thrownoff their loopers, and under the action of the tension device they rise towards the cloth,.forming stitches with the parts 20 and 2'1 of the cop'yarn, thus producing the'stitches; However at the time atwhich they are released from their loopers,

the loops G and D .haveas observed a considerable length, such as is necessaryfortheir free release from each looper.

At this time, if the speed of the machine exceeds a certain limit, it is shown by experience that these loops are each thrown towards the vertical. plane of symmetry of the loopers. Thejloops will thus meet in a violent manner, become entangled and will I break when the tension device rises suddenly thenext moment. H a To obviate this drawback, the invention;

consists in disposing on the machinefat the 1 1.0.0 I

point at which theloopstendto'meet one:

said loops;

another, a partition adapted to separate the theloopers, whereby said loops are prevented from becoming entangled at that point when In Figs. 1 and 2, the said partition is shown the machine is working at high speed.

, In testimony whereof I have signed this at 36, and it consists of a plate of suitable.

form mounted on the needle plate 35 and specification.

against the guide rodof the needles '37. Due to the said partition, as shown in the plan View Fig; 2, which corresponds to Fig. 1, the

loops C and D will strike against the small plate 36, withoutmeeting or tangling.

4 shows another embodiment of the mvention in which the metal plate 36 forming the partition is removable. Below the needle plate 35 is feed dog 40, and its support hole formed in the feed dog 4-1. Herein the small removable separating plate 36- is fixed to the feed dog support by the screws 43, and it is inserted through a it is quite distinct from the needle plate.

Fig. 5 is a perspective view of the said small plate or partition 36 which obviously forms a sufiicient separation between the two needles :to' prevent all Contact between the yarn loops; a r i The machine which is provided with the said partition according to the invention will be enabled to operate at very high speeds without any breakage of the yarn.

In "the following claims, the word partia tion relates to a device which is distinct from the guide-rod37-for the needles, and is i mounted in the machine inv addition to this guide-rod, when the machine employs such-a guide-rod. The partition may be formed upon the guide rod itself, as disclosed, or may be othe'rwise disposed. I Obviously, the invention is not-limited to machinesemployingsuch a guide-rod. 5' What I claim is: l'

' 4 i} LHA sewing machineofthetype describedprovided withia needleguide rodvcomprising 1n comblnation two loopers adapted to rotate in opposite directlons, a needle plate, and

- apartitionplatemountedon said needle plate between "said loopers adjacent said needle guide rodand extending in the direction in which the cloth is moving beyond the pointfat which the loops formed by the needle threads released from the loopers, whereby said loops are prevented from becoming entangled at that point when the machineis working at high speed. I I K I a 2. I A sewing machine of the type described provided with a needle guide rod, comprising in combination, two loopers adapted to rotate in opposite directions, a needle plate, and a partition plate mounted on said needle plate between said loopers adjacent said needle guide rod and extending in a direction 7 opposite to the direction inwhich the loopers tend to make contact with each other when JACQUES OLLENDQRFF. 

